Apentix/AP Biology/Unit 7: Natural Selection/Question
AP Biologyhardmcq1 pt

Scientists use DNA sequence data to construct a phylogenetic tree for several related species. In this tree, Species X and Species Y share a most recent common ancestor that is not shared by Species Z. Which of the following statements is true regarding the classification of Species X and Species Y?

Explanation

Core Concept

This is correct because a monophyletic group (clade) consists of an ancestral species and all of its descendants. Since X and Y share a most recent common ancestor exclusive to Z, they form a valid clade.

Correct Answer

q4_mono

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